ToolVet
75trust / 100

Receipts Signature

by Ed25519 Receipt Verification in Security & trust

x402 APIPassing, checked 6 h ago

Verify one Ed25519 signature over up to 8,000 characters of exact UTF-8 receipt text using a supplied 32-byte public key. Returns cryptographic validity and message hash. Does not establish issuer identity, trusted time, licensing or the truth of the receipt. No private keys accepted. New modular adapter: retained result recovery for 24 hours, minimal receipt metadata for 90 days. Existing live route unchanged.

POST https://www.mahastrategies.com/api/v1/verify/receipts/signature

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
193 ms typical, 193 ms slowest 5%
Last check
6 h ago
Next check
any minute now

How to call it

POST https://www.mahastrategies.com/api/v1/verify/receipts/signature

Each call costs $0.012501 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://www.mahastrategies.com/api/v1/verify/receipts/signature
content-type: application/json

{
  "dataClass": "synthetic",
  "encoding": "exact-utf8",
  "message": "Synthetic receipt; no transaction asserted.",
  "publicKeyBase64": "AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE=",
  "signatureBase64": "AgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg=="
}

Parameters

ParameterTypeRequiredDescription
dataClassstringYes One of: public, synthetic.
encodingstringYes One of: exact-utf8.
messagestringYes
publicKeyBase64stringYes
signatureBase64stringYes

Example response

The provider's example. We can't check it without paying.

{
  "data": {
    "chargedAmount": "12501",
    "inputHash": "sha256:cef35b88c8fc3ffc04729117625615013d21e1c45304e247ec136a54e…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "signed-receipt-verification",
    "result": {
      "algorithm": "Ed25519",
      "factsVerified": false,
      "issuerIdentityVerified": false,
      "messageDigest": "sha256:a2db85041891d6dbe10c85b018ee68dea1b9a891799cd5690336ebb57…",
      "signatureValid": false
    },
    "resultHash": "sha256:4f6611c34d22d0977df7e70833c9d9a588e9c51d9711c06181ffc6a0c…",
    "sourceContractAmount": "12500",
    "version": "maha-legacy-adapter/1"
  },
  "proof": {
    "settlement_id": "0x00000000000000000000000000000000000000000000000000000000000000…"
  },
  "success": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.012501.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.mahastrategies.com/api/v1/verify/receipts/signature' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","encoding":"exact-utf8","message":"Synthetic receipt; no transaction asserted.","publicKeyBase64":"AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE=","signatureBase64":"AgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg=="}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://www.mahastrategies.com/api/v1/verify/receipts/signature' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","encoding":"exact-utf8","message":"Synthetic receipt; no transaction asserted.","publicKeyBase64":"AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE=","signatureBase64":"AgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg=="}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.012501 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.012501" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.012501 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fverify%2Freceipts%2Fsignature&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/verify/receipts/signature", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "dataClass": "synthetic",
    "encoding": "exact-utf8",
    "message": "Synthetic receipt; no transaction asserted.",
    "publicKeyBase64": "AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE=",
    "signatureBase64": "AgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg=="
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.012501 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.012501"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://www.mahastrategies.com/api/v1/verify/receipts/signature",
        json={
            "dataClass": "synthetic",
            "encoding": "exact-utf8",
            "message": "Synthetic receipt; no transaction asserted.",
            "publicKeyBase64": "AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQE=",
            "signatureBase64": "AgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg==",
        },
    )
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
6 h agoPassed402193 ms$0.013